LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling,Using line or loop condition detection

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Device for detecting DTMF tones

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Device for detecting telephone line seizure

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Device for identifying line reversal/ringing signal of a telepho

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Dial pulse detector and detecting method for paging service for

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Disconnect signalling detection arrangement

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Double duty capacitor circuit and method

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Electronic switch for digital telephone

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Event detection circuit

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Fallback function telecommunications device

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Far-end disconnect detector for telephony systems

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ground start and tip ground detection without the use of -48V or

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Half-duplex controller

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Half-duplex speakerphone

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Hands-free speaking device with echo canceler

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Hands-free telephone apparatus

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

High impedance polarity detector

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

High voltage detection circuit, bell signal detection circuit an

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Hybrid circuit for an electric operating and scanning interface,

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Integrated ringer for short telephone lines